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Preparation of melamine formaldehyde/nanozeolite Y composite based on nanosilica extracted from rice husks by sol–gel method: adsorption of lead (II) ion
Journal of Sol-Gel Science and Technology ( IF 2.3 ) Pub Date : 2020-04-24 , DOI: 10.1007/s10971-020-05295-y
Asaad F. Hassan , Fouzy Alafid , Radim Hrdina

In the present work nanozeolite Y was prepared from nanosilica powder extracted from rice husks ash by sol–gel method as a green biosource (NZ). Melamine formaldehyde resin (MF) and melamine formaldehyde/nanozeolite Y (MFZ) particles were prepared at pH 9 and 110 °C. NZ, MF, and MFZ were characterized using TGA, SEM, XRD, nitrogen adsorption, pHPZC, and FTIR. Melamine formaldehyde/nanozeolite Y exhibited an advanced textural structure with surface area of 1035.6 m2/g and abundance of chemical functional groups. Lead ions adsorption was investigated under different application conditions considering thermodynamic and kinetics studies. The maximum adsorption capacity (qm, mg/g) was confirmed by MFZ and found to be 180.8 after 60 min of equilibrium time at pH6, 1.0 g/L as adsorbent dosage, and at 40 °C. Lead (II) adsorption onto solid adsorbents fitted with Langmuir adsorption, pseudo-second order, Elovich kinetic, and Vant Hoff’s models. Thermodynamic investigations showed that lead adsorption by all the adsorbents are spontaneous and endothermic.



中文翻译:

溶胶-凝胶法从稻壳提取纳米二氧化硅制备三聚氰胺甲醛/纳米沸石Y复合材料:吸附铅离子

在目前的工作中,Y沸石是用溶胶-凝胶法从稻壳灰中提取的纳米二氧化硅粉作为绿色生物源(NZ)制备的。在pH 9和110°C下制备三聚氰胺甲醛树脂(MF)和三聚氰胺甲醛/纳米沸石Y(MFZ)颗粒。使用TGA,SEM,XRD,氮吸附,pH PZC和FTIR对NZ,MF和MFZ进行表征。三聚氰胺甲醛/纳米沸石Y表现出先进的组织结构,表面积为1035.6 m 2 / g,具有大量的化学官能团。考虑到热力学和动力学研究,在不同的应用条件下研究了铅离子的吸附。最大吸附量(q,由MFZ确认,在平衡时间60分钟(pH6),1.0 g / L作为吸附剂剂量和40°C平衡时间60分钟后为180.8。铅(II)吸附在符合Langmuir吸附,拟二级,Elovich动力学和Vant Hoff模型的固体吸附剂上。热力学研究表明,所有吸附剂对铅的吸附都是自发的并且是吸热的。

更新日期:2020-04-24
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